Game of Thrones season 7 spoilers: Arya Stark's bag of faces reveals THIS character?

GAME OF THRONES' penultimate episode saw a tense face-off between Sansa and Arya, during which the eldest Stark female happened upon her sister's chilling sack of faces. But whose skins were in the bag?

The sixth episode of the HBO series' seventh season saw Arya (played by Maisie Williams) threaten the acting Queen of the North - Sansa (Sophie Turner) - with the possibility that she would make her another one of her victims and slice off her face.

The menacing moment came when Arya revealed she knew about Sansa's letter of betrayal from season two - which was planted by the conniving Littlefinger (Aidan Gillen). But as the siblings argued and Sansa reached into her sister's bag to retrieve the letter, she found the horrifying pile of mementoes instead.

When Sansa demanded an explanation from her sibling however, Arya simply stated "my faces" in response.

The first face Sansa came across is Arya's latest kill Walder Frey (David Bradley), who she brutally forced to eat his sons' remains. The cold open was this series' most unexpected moment, and saw the Stark Lady finally get revenge on the deaths of her mother and eldest brother from season three's Red Wedding episode.

The other faces were more difficult to recognise, but there are a number of possibilities, with one more visible and complete with a beard.

One option is that the bearded face could have belonged to Ser Meryn Trant, though the fact that Arya killed the knight who served Baratheon kings Robert (Mark Addy) and Joffrey (Jack Gleeson) by stabbing him in both eyes means it's unlikely, as the face appeared to be uninjured.

Another possibility is that after murdering Walder's two sons Lothar and Black Frey, she decided to feed their father a portion of their bodies but kept their faces to add to her growing collection of disguises.

The men also had beards, so it wouldn't be too much of a stretch to guess that one of theirs was the face fans caught a glimpse of onscreen.

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It is also important to note that it still hasn't been explained exactly how Arya can transform herself fully into the person she is masquerading as - voice and all - so perhaps the face is actually a healed Meryn whose gauged out eyeballs have somehow magically returned.

It also stands to reason that given the fact Arya murdered a whole host of House Frey members in the season seven premiere, she could have picked up a few unnamed members as backups.

Arya and Sansa have been increasingly hostile towards each other since their briefly happy reunion in Winterfell, due to Arya's suspicions about her sister. But as the tension between them reached murderous heights in the latest episode, could their stand-off have been the catalyst for ether theirs or Littlefinger's death in the highly-anticipated finale?

"I love the fact that these two come back, they're both lethal, and I just wanted to give the impression, as much as possible, that one of them is going to die. But you're not sure which one," Alan told HuffPost.

Game of Thrones season 7 concludes on Monday August 28 at 2am and 9pm on Sky Atlantic and NOW TV.